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In this Letter, we demonstrate theoretically that electromagnetic waves can be "squeezed" and tunneled through very narrow channels filled with ε-near-zero (ENZ) materials. We show that the incoming planar wave front is replicated at the output interface, independently of the specific geometry of the channel. A closed analytical formula is derived for the scattering parameters of a particular class of geometries. It is discussed that in some cases the isotropy of the ENZ material may not be an issue. A metamaterial realization of an anisotropic ENZ material is suggested and numerically studied.
Silveirinha, Mário and Engheta, Nader, "Tunneling of Electromagnetic Energy through Subwavelength Channels and Bends using ε-Near-Zero Materials" (2006). Departmental Papers (ESE). Paper 213.
Date Posted: 07 December 2006
This document has been peer reviewed.